簡便運算36*1.28+8.2*3.6-3.6

簡便運算36*1.28+8.2*3.6-3.6

36x1.28+8.2x3.6-3.6
=36x1.28+(8.2-1)x3.6
=3.6x12.8+7.2x3.6
=(12.8+7.2)x3.6
=20x3.6
=72